Hydro-Draconic Archive

You may pay {2} instead of {r}, {g}, or {b}
(pay for each)
On your end step if you control a creature with
power or toughness 4 or greater draw a card.
On each end step if any number of players
combined control 3 creatures with power
or toughness 7 or higher exile Hydro-Draconic
Archive and transform it into Don Silver,
Beast Master on your next upkeep.